No clue what the EGR is if i'm totally honest. If you mean the valve at the back of the black bellowed air pipe, yes that can blow out with a blocked breather.
The only blocked recirculation i ever had was a replacement PCV / oil seperator job on the front of the block under the inlet manifold. Turned out the PCV wasn't itself blocked but the pipe at the bottom of it leading back into the engine was. PITA job to do though as it was a manifold off job.
Run the engine for a few minutes and then pull the oil dipstick. If its blocked like mine was (which was completely blocked) then you'll probably get a gushing sound.
I posted similar info here in this thread - no idea if it helps - good luck!:
viewtopic.php?f=3&t=353&p=1622&hilit=pcv#p1615